1.MAIL> SET AUTO_PURGE
      MAIL> SHOW AUTO_PURGE
      Automatic deleted message purge is enabled.

      This example shows how to use the SET AUTO_PURGE command to
      enable Mail to delete the messages in the WASTEBASKET folder
      every time you enter the EXIT command or the SET FILE command.
      The SHOW AUTO_PURGE command displays whether automatic purging
      is enabled.